Startup does not work

Good evening, last Friday the system was working properly, from this morning instead when I try to activate the system I get this error:

VBoxHeadless --startvm ERPNext
Oracle VM VirtualBox Headless Interface 6.1.38_Ubuntu
(C) 2008-2022 Oracle Corporation
All rights reserved.

Starting virtual machine:
Error: failed to start machine. Error message: Locking of attached media failed. A possible reason is that one of the media is attached to a running VM

I kindly ask you how I can solve. Thank you very much.